I too am relatively new to digital DJing (I have a Twitch as well), and I feel like there are fifty different things that need to all be in the right setting for the sound to come out where it’s supposed to, so don’t sweat it.
You’re right, there isn’t any place in the ITCH software to switch output routing (part of the whole “ready to go out of the box” thing), so it’s likely a setting on the Twitch itself. Some things to check:
– Are you running sound out through the booth (RCA), or the master (TRS)? Either works, but they have two different volume controls (the upper right corner of the controller). So if you’re going out through the RCAs (which I sometimes do when I practice), the “master” volume control doesn’t do anything. Likewise with the “booth” volume knob if you’re going out the TRS.
– If you’re using the booth out, check out the switch on the back, if it’s set to “master” or “cue”. If it’s set to “cue”, the mix will depend on what the mix of master and cue is on the knob right above it on the controller face (the master/cue knob). Better to have it set to Master if it’s acting as your main out regardless.
– If it’s not any of these things, check the level faders, crossfaders, and FX bank. I drop tracks in all the time when I’m practicing and trying to move between tracks quickly only to find no sound, and realizing it’s because my crossfader is on one side or the other, or that I left the LPF on that deck with the depth turned all the way up so nothing can come through, or something basic and stupid like that.
Anyway, hope something in here might have been helpful, if you haven’t yet solved the problem.